[libvirt] [PATCH 2/8] Introduce new XMLs to specify disk source using libvirt storage
Osier Yang
jyang at redhat.com
Thu Apr 4 19:37:56 UTC 2013
With this patch, one can specify the disk source using libvirt
storage like:
<disk type='volume' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source pool='default' volume='fc18.img'/>
<target dev='vdb' bus='virtio'/>
</disk>
"seclables" and "startupPolicy" are not supported for this new
disk type ("volume"). They will be supported in later patches.
docs/formatdomain.html.in:
* Add documents for new XMLs
docs/schemas/domaincommon.rng:
* Add rng for new XMLs;
src/conf/domain_conf.h:
* New struct for 'volume' type disk source (virDomainDiskSourcePoolDef)
* Add VIR_DOMAIN_DISK_TYPE_VOLUME for enum virDomainDiskType
src/conf/domain_conf.c:
* New helper virDomainDiskSourcePoolDefParse to parse the 'volume'
type disk source.
* New helper virDomainDiskSourcePoolDefFree to free the source def
if 'volume' type disk.
tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml:
tests/qemuxml2xmltest.c:
* New test
---
docs/formatdomain.html.in | 15 +++-
docs/schemas/domaincommon.rng | 18 +++++
src/conf/domain_conf.c | 89 ++++++++++++++++++++--
src/conf/domain_conf.h | 9 +++
.../qemuxml2argv-disk-source-pool.xml | 33 ++++++++
tests/qemuxml2xmltest.c | 1 +
6 files changed, 157 insertions(+), 8 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index cf382e8..bdc815f 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1372,6 +1372,11 @@
<blockio logical_block_size='512' physical_block_size='4096'/>
<target dev='hda' bus='ide'/>
</disk>
+ <disk type='volume' device='disk'>
+ <driver name='qemu' type='raw'/>
+ <source pool='blk-pool0' volume='blk-pool0-vol0'/>
+ <target dev='hda' bus='ide'/>
+ </disk>
</devices>
...</pre>
@@ -1452,10 +1457,16 @@
<code>iqn.1992-01.com.example/1</code>); the default LUN is zero.
When the disk <code>type</code> is "network", the <code>source</code>
may have zero or more <code>host</code> sub-elements used to
- specify the hosts to connect.
+ specify the hosts to connect. If the disk <code>type</code> is
+ "volume", the underlying disk source is represented by attributes
+ <code>pool</code> and <code>volume</code>. Attribute <code>pool</code>
+ specifies the name of storage pool (managed by libvirt) where the disk
+ source resides, and attribute <code>volume</code> specifies the name of
+ storage volume (managed by libvirt) used as the disk source.
<span class="since">Since 0.0.3; <code>type='dir'</code> since
0.7.5; <code>type='network'</code> since
- 0.8.7; <code>protocol='iscsi'</code> since 1.0.4</span><br/>
+ 0.8.7; <code>protocol='iscsi'</code> since 1.0.4;
+ <code>type='volume'</code> since 1.0.5;</span><br/>
For a "file" disk type which represents a cdrom or floppy
(the <code>device</code> attribute), it is possible to define
policy what to do with the disk if the source file is not accessible.
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 454ebdb..46cccc4 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1090,6 +1090,24 @@
<ref name="diskspec"/>
</interleave>
</group>
+ <group>
+ <attribute name="type">
+ <value>volume</value>
+ </attribute>
+ <interleave>
+ <optional>
+ <element name="source">
+ <attribute name="pool">
+ <ref name="genericName"/>
+ </attribute>
+ <attribute name="volume">
+ <ref name="volName"/>
+ </attribute>
+ </element>
+ </optional>
+ <ref name="diskspec"/>
+ </interleave>
+ </group>
<ref name="diskspec"/>
</choice>
</element>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 8288959..8538d5f 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -207,7 +207,8 @@ VIR_ENUM_IMPL(virDomainDisk, VIR_DOMAIN_DISK_TYPE_LAST,
"block",
"file",
"dir",
- "network")
+ "network",
+ "volume")
VIR_ENUM_IMPL(virDomainDiskDevice, VIR_DOMAIN_DISK_DEVICE_LAST,
"disk",
@@ -1085,6 +1086,18 @@ void virDomainLeaseDefFree(virDomainLeaseDefPtr def)
VIR_FREE(def);
}
+static void
+virDomainDiskSourcePoolDefFree(virDomainDiskSourcePoolDefPtr def)
+{
+ if (!def)
+ return;
+
+ VIR_FREE(def->pool);
+ VIR_FREE(def->volume);
+
+ VIR_FREE(def);
+}
+
void virDomainDiskDefFree(virDomainDiskDefPtr def)
{
unsigned int i;
@@ -1094,6 +1107,7 @@ void virDomainDiskDefFree(virDomainDiskDefPtr def)
VIR_FREE(def->serial);
VIR_FREE(def->src);
+ virDomainDiskSourcePoolDefFree(def->srcpool);
VIR_FREE(def->dst);
VIR_FREE(def->driverName);
virStorageFileFreeMetadata(def->backingChain);
@@ -3935,6 +3949,46 @@ cleanup:
goto cleanup;
}
+static int
+virDomainDiskSourcePoolDefParse(xmlNodePtr node,
+ virDomainDiskDefPtr def)
+{
+ char *pool = NULL;
+ char *volume = NULL;
+ int ret = -1;
+
+ pool = virXMLPropString(node, "pool");
+ volume = virXMLPropString(node, "volume");
+
+ /* CD-ROM and Floppy allows no source */
+ if (!pool && !volume)
+ return 0;
+
+ if (!pool || !volume) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("'pool' and 'volume' must be specified together "
+ "for 'pool' type source"));
+ goto cleanup;
+ }
+
+ if (VIR_ALLOC(def->srcpool) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ def->srcpool->pool = pool;
+ pool = NULL;
+ def->srcpool->volume = volume;
+ volume = NULL;
+
+ ret = 0;
+
+cleanup:
+ VIR_FREE(pool);
+ VIR_FREE(volume);
+ return ret;
+}
+
#define VENDOR_LEN 8
#define PRODUCT_LEN 16
@@ -4030,7 +4084,7 @@ virDomainDiskDefParseXML(virCapsPtr caps,
cur = node->children;
while (cur != NULL) {
if (cur->type == XML_ELEMENT_NODE) {
- if (!source && !hosts &&
+ if (!source && !hosts && !def->srcpool &&
xmlStrEqual(cur->name, BAD_CAST "source")) {
sourceNode = cur;
@@ -4123,6 +4177,10 @@ virDomainDiskDefParseXML(virCapsPtr caps,
child = child->next;
}
break;
+ case VIR_DOMAIN_DISK_TYPE_VOLUME:
+ if (virDomainDiskSourcePoolDefParse(cur, def) < 0)
+ goto error;
+ break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected disk type %s"),
@@ -4421,7 +4479,7 @@ virDomainDiskDefParseXML(virCapsPtr caps,
/* Only CDROM and Floppy devices are allowed missing source path
* to indicate no media present */
- if (source == NULL && hosts == NULL &&
+ if (source == NULL && hosts == NULL && !def->srcpool &&
def->device != VIR_DOMAIN_DISK_DEVICE_CDROM &&
def->device != VIR_DOMAIN_DISK_DEVICE_FLOPPY) {
virReportError(VIR_ERR_NO_SOURCE,
@@ -4443,8 +4501,19 @@ virDomainDiskDefParseXML(virCapsPtr caps,
}
if (target == NULL) {
- virReportError(VIR_ERR_NO_TARGET,
- source ? "%s" : NULL, source);
+ if (def->srcpool) {
+ char *tmp;
+ if (virAsprintf(&tmp, "pool = '%s', volume = '%s'",
+ def->srcpool->pool, def->srcpool->volume) < 0) {
+ virReportOOMError();
+ goto error;
+ }
+
+ virReportError(VIR_ERR_NO_TARGET, "%s", tmp);
+ VIR_FREE(tmp);
+ } else {
+ virReportError(VIR_ERR_NO_TARGET, source ? "%s" : NULL, source);
+ }
goto error;
}
@@ -12745,7 +12814,7 @@ virDomainDiskSourceDefFormat(virBufferPtr buf,
int n;
const char *startupPolicy = virDomainStartupPolicyTypeToString(def->startupPolicy);
- if (def->src || def->nhosts > 0 ||
+ if (def->src || def->nhosts > 0 || def->srcpool ||
def->startupPolicy) {
switch (def->type) {
case VIR_DOMAIN_DISK_TYPE_FILE:
@@ -12817,6 +12886,14 @@ virDomainDiskSourceDefFormat(virBufferPtr buf,
virBufferAddLit(buf, " </source>\n");
}
break;
+ case VIR_DOMAIN_DISK_TYPE_VOLUME:
+ /* Parsing guarantees the def->srcpool->volume cannot be NULL
+ * if def->srcpool->pool is not NULL.
+ */
+ if (def->srcpool->pool)
+ virBufferAsprintf(buf, " <source pool='%s' volume='%s'/>\n",
+ def->srcpool->pool, def->srcpool->volume);
+ break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected disk type %s"),
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index edddf25..988636e 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -447,6 +447,7 @@ enum virDomainDiskType {
VIR_DOMAIN_DISK_TYPE_FILE,
VIR_DOMAIN_DISK_TYPE_DIR,
VIR_DOMAIN_DISK_TYPE_NETWORK,
+ VIR_DOMAIN_DISK_TYPE_VOLUME,
VIR_DOMAIN_DISK_TYPE_LAST
};
@@ -606,6 +607,13 @@ struct _virDomainBlockIoTuneInfo {
};
typedef virDomainBlockIoTuneInfo *virDomainBlockIoTuneInfoPtr;
+typedef struct _virDomainDiskSourcePoolDef virDomainDiskSourcePoolDef;
+struct _virDomainDiskSourcePoolDef {
+ char *pool; /* pool name */
+ char *volume; /* volume name */
+};
+typedef virDomainDiskSourcePoolDef *virDomainDiskSourcePoolDefPtr;
+
/* Stores the virtual disk configuration */
struct _virDomainDiskDef {
int type;
@@ -617,6 +625,7 @@ struct _virDomainDiskDef {
int protocol;
size_t nhosts;
virDomainDiskHostDefPtr hosts;
+ virDomainDiskSourcePoolDefPtr srcpool;
struct {
char *username;
int secretType; /* enum virDomainDiskSecretType */
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml
new file mode 100644
index 0000000..876eebe
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml
@@ -0,0 +1,33 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ <disk type='volume' device='cdrom'>
+ <source pool='blk-pool0' volume='blk-pool0-vol0'/>
+ <target dev='hda' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='0' target='0' unit='1'/>
+ </disk>
+ <disk type='file' device='disk'>
+ <source file='/tmp/idedisk.img'/>
+ <target dev='hdc' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='2'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='ide' index='1'/>
+ <memballoon model='virtio'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index ba9aa96..fa79960 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -252,6 +252,7 @@ mymain(void)
DO_TEST("disk-scsi-lun-passthrough-sgio");
DO_TEST("disk-scsi-disk-vpd");
+ DO_TEST("disk-source-pool");
DO_TEST("virtio-rng-random");
DO_TEST("virtio-rng-egd");
--
1.8.1.4
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